8 # Check how to get the amount of physical memory.
9 # This information is used in tuklib_physmem.c.
13 # - Windows (including Cygwin), OS/2, DJGPP (DOS), and OpenVMS have
14 # operating-system specific functions.
16 # - AIX has _system_configuration.physmem.
18 # - sysconf() works on GNU/Linux and Solaris, and possibly on
21 # - BSDs use sysctl().
23 # - Tru64 uses getsysinfo().
25 # - HP-UX uses pstat_getstatic().
27 # - IRIX has setinvent_r(), getinvent_r(), and endinvent_r().
29 # - sysinfo() works on Linux/dietlibc and probably on other Linux
30 # systems whose libc may lack sysconf().
34 # Author: Lasse Collin
36 # This file has been put into the public domain.
37 # You can do whatever you want with this file.
40 AC_DEFUN_ONCE([TUKLIB_PHYSMEM], [
41 AC_REQUIRE([TUKLIB_COMMON])
43 # sys/param.h might be needed by sys/sysctl.h.
44 AC_CHECK_HEADERS([sys/param.h])
46 AC_CACHE_CHECK([how to detect the amount of physical memory],
47 [tuklib_cv_physmem_method], [
49 # Maybe checking $host_os would be enough but this matches what
50 # tuklib_physmem.c does.
52 # NOTE: IRIX has a compiler that doesn't error out with #error, so use
53 # a non-compilable text instead of #error to generate an error.
54 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
55 #if defined(_WIN32) || defined(__CYGWIN__) || defined(__OS2__) \
56 || defined(__DJGPP__) || defined(__VMS)
57 int main(void) { return 0; }
61 ]])], [tuklib_cv_physmem_method=special], [
63 # Look for AIX-specific solution before sysconf(), because the test
64 # for sysconf() will pass on AIX but won't actually work
65 # (sysconf(_SC_PHYS_PAGES) compiles but always returns -1 on AIX).
66 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
67 #include <sys/systemcfg.h>
72 (void)_system_configuration.physmem;
75 ]])], [tuklib_cv_physmem_method=aix], [
77 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
83 i = sysconf(_SC_PAGESIZE);
84 i = sysconf(_SC_PHYS_PAGES);
87 ]])], [tuklib_cv_physmem_method=sysconf], [
89 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
90 #include <sys/types.h>
91 #ifdef HAVE_SYS_PARAM_H
92 # include <sys/param.h>
94 #include <sys/sysctl.h>
98 int name[2] = { CTL_HW, HW_PHYSMEM };
100 size_t mem_ptr_size = sizeof(mem);
101 sysctl(name, 2, &mem, &mem_ptr_size, NULL, 0);
104 ]])], [tuklib_cv_physmem_method=sysctl], [
106 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
107 #include <sys/sysinfo.h>
108 #include <machine/hal_sysinfo.h>
115 getsysinfo(GSI_PHYSMEM, (caddr_t)&memkb, sizeof(memkb), &start);
118 ]])], [tuklib_cv_physmem_method=getsysinfo],[
120 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
121 #include <sys/param.h>
122 #include <sys/pstat.h>
127 struct pst_static pst;
128 pstat_getstatic(&pst, sizeof(pst), 1, 0);
129 (void)pst.physical_memory;
133 ]])], [tuklib_cv_physmem_method=pstat_getstatic],[
135 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
140 inv_state_t *st = NULL;
146 ]])], [tuklib_cv_physmem_method=getinvent_r], [
148 # This version of sysinfo() is Linux-specific. Some non-Linux systems have
149 # different sysinfo() so we must check $host_os.
152 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
153 #include <sys/sysinfo.h>
162 tuklib_cv_physmem_method=sysinfo
164 tuklib_cv_physmem_method=unknown
168 tuklib_cv_physmem_method=unknown
173 case $tuklib_cv_physmem_method in
175 AC_DEFINE([TUKLIB_PHYSMEM_AIX], [1],
176 [Define to 1 if the amount of physical memory
177 can be detected with _system_configuration.physmem.])
180 AC_DEFINE([TUKLIB_PHYSMEM_SYSCONF], [1],
181 [Define to 1 if the amount of physical memory can
182 be detected with sysconf(_SC_PAGESIZE) and
183 sysconf(_SC_PHYS_PAGES).])
186 AC_DEFINE([TUKLIB_PHYSMEM_SYSCTL], [1],
187 [Define to 1 if the amount of physical memory can
188 be detected with sysctl().])
191 AC_DEFINE([TUKLIB_PHYSMEM_GETSYSINFO], [1],
192 [Define to 1 if the amount of physical memory can
193 be detected with getsysinfo().])
196 AC_DEFINE([TUKLIB_PHYSMEM_PSTAT_GETSTATIC], [1],
197 [Define to 1 if the amount of physical memory can
198 be detected with pstat_getstatic().])
201 AC_DEFINE([TUKLIB_PHYSMEM_GETINVENT_R], [1],
202 [Define to 1 if the amount of physical memory
203 can be detected with getinvent_r().])
206 AC_DEFINE([TUKLIB_PHYSMEM_SYSINFO], [1],
207 [Define to 1 if the amount of physical memory
208 can be detected with Linux sysinfo().])